か トチュウ科 LinksSentence search for トチュウ科Sentence search for トチュウかSentence search for 杜仲科Sentence search for とちゅうかKanji details for 科Edit in JMdict Noun1. Eucommiaceae (monotypic plant family containing only the hardy rubber tree)See also 杜仲Other forms杜仲科 【とちゅうか】 Discussions Log in to talk about this word.